Handheld imaging microscope

ABSTRACT

A handheld imaging microscope for imaging tissue samples substantially beneath the surface of the tissue sample. The microscope includes an objective lens and a window defining a tissue contacting surface in pressure contacting relationship with the surface of the tissue sample when the tissue sample is imaged by the objective lens to view tissue structures for pathological applications. The objective lens focuses an illumination beam through the window to the tissue sample and receives returned reflected light of the beam representative of one or more sections of the tissue sample.

This application is a continuation of application Ser. No. 08/650,684 filed May 20, 1996, now U.S. Pat. No. 5,788,639, which claims the priority benefit of copending provisional application Ser. No. 60/001,141, filed Jul. 13, 1995.

FIELD OF THE INVENTION

The present invention relates to handheld confocal imaging system for in vivo clinical examinations of dermal and subdermal tissues using non-ionizing radiation, and particularly laser radiation which is of a wavelength capable of penetrating into the skin.

The invention is especially suitable for providing an instrument for dermal pathology applications. The invention is also applicable for visualizing sections in other scattering media than tissue. The invention enables the use of a laser as a source of illumination. The instrument may provide data to image processing computers, which may be programmed to provide high resolution images of dermal sections.

BACKGROUND OF THE INVENTION

Systems have been proposed for viewing the surface areas of the skin or the external surfaces of internal tissue. Viewing without scanning is described in Pennypacker, U.S. Pat. No. 4,817,622, issued Apr. 4, 1989. Examination of internal tissue surfaces by means of beam scanning are proposed in Harris, U.S. Pat. No. 5,120,953, issued Jun. 91 1992, Ohki, U.S. Pat. No. 5,122,653 issued Jun. 16, 1992, Webb, U.S. Pat. No. 4,768,874 issued Sep. 6, 1988 and Pflibsen, U.S. Pat. No. 4,991,953 issued Feb. 12, 1991. Such proposals have not provided a handheld instrument which is readily usable by a surgeon in clinical examinations for imaging the epidermis and dermis, especially in vertical sections or in horizontal sections at desired depths below the surface of the skin.

SUMMARY OF THE INVENTION

Accordingly, it is the principal object of the present invention to provide and improve clinical dermatological imaging system.

It is another object of the invention to provide an improved confocal imaging system which provides images of dermatological tissues and avoids the need for biopsies to detect the location of such abnormalities as basal cell carcinomas and melanomas.

It is a still further object of the present invention to provide an improved confocal dermatological imaging system which does not require ionizing radiation and may use a laser beam.

It is a still further object of the present invention is to provide an improved confocal imaging system which provides in vivo imaging of dermatological tissue both at and below the skin and which may be handheld and which is capable of operating in various scattering media.

It is a still further object of the present invention to provide an improved confocal dermatological imaging system which may use a computer to generate images from data produced by the optics which provides confocal imaging and to display or provide images for further evaluation or computer enhancement.

BRIEF DESCRIPTION OF THE DRAWINGS

The foregoing objects, features and advantages of the invention will become more apparent from a reading of the following description in connection with the accompanying drawings in which:

FIG. 1 is schematic diagram of a confocal imaging system embodying the invention;

FIG. 1a is a plan view of the head of the system shown in FIG. 1;

FIG. 2 is a block diagram of the system shown in FIG. 1, and especially the computer control and imaging system for acquisition and processing of the optical image;

FIG. 3 is a schematic diagram of the handheld confocal imaging system of FIG. 2 in use.

DETAILED DESCRIPTION OF THE INVENTION

Referring to FIG. 1 there is shown a system 10 for in vivo diagnosis of dermatological tissues. The system 10 may be embodied in a handheld head 32 as shown in FIG. 1a and schematically in FIG. 3.

Referring more particularly to FIG. 1 there is shown a system 10 (or instrument) which contains optics of the type which are used in optical data storage heads which are used in recording and reading optical disks. Light from a laser diode, contained in a laser and collimator assembly 12, is collimated by a diffraction limited lens in the assembly 12 and is incident at an oblique angle on a beam splitter assembly 14. Refraction at this oblique angle causes the elliptical laser diode beam to become circular in cross-section. The circular beam passes through the beam splitter assembly 14 and a quarter wave plate 16 and is focused into the tissue 22 via a contact window 20 (a glass window plate) spaced from the sample, specimen or tissue 22 being examined, preferably by an optical contact liquid 21. In the event the sample is viscus or liquid, it may be located in a sample well (not shown).

The circular beam which passes through the beam splitter assembly 14 and the quarter wave plate 16 is focused into the sample by a precision focusing lens 18, which suitably has a numerical aperture of 0.5 and a focal length of 4.3 millimeters. These dimensions and parameters are exemplary and demonstrate that the optical system 10 may be miniaturized so as to be adapted to be handheld.

The quarter wave plate 16 converts the incident linear polarization from the laser in assembly 12 to circular polarization, i.e., the quarter wave plate is oriented 45° to the incident polarization. In other words, the beam from plate 16 is circularly polarized. The focusing lens 18 is movable both in a direction along its optical axis and laterally as indicated by the arrows 24 and 25, respectively. Position mechanical actuators 34 (FIG. 1a) may be used for moving the lens 18, and thereby control position of the focus spot of beam in the sample. These actuators 34 may be similar to those used in optical disk systems. The lens 18 may be mounted on a pair of such mechanical actuators. The actuators 34 provide lateral and vertical scanning of the focused laser beam in the tissue sample.

The focusing lens 18 also collects scattered light reflected from the sample. The amount of coherent light scattered back into the detection system (which includes lens 18, plate 16 and assembly 14) depends upon local variations of the refractive index and the absorption in the immediate neighborhood of the focus spot. This coherent light may be defined as the component of the reflected light having a circular polarization orthogonal to the polarization of the beam focused into the tissue sample. The scattered light is incident to plate 16 and then to beam splitter assembly 14. The plate 18 converts the coherent component of the scattered light into linear polarization, where beam splitter assembly 14 directs by reflection (or filters) the coherent light component of the scattered light at the beam splitting surface 15 in the beam splitter assembly 14. The reflected light passes through a relay lens 26. The light from relay lens 26 may be reflected from a pair of fold mirrors 28 (See also FIG. 1a). These fold mirrors 28 may be part of the beam splitter assembly 14. The relay lens 26 may also be part of this assembly 14.

The scanned light from the focus spot is reflected from the fold mirrors 28 to a pinhole photodetector assembly 30, which may also be considered part of the detection system. The fold mirrors 28 are used to make the instrument more compact. A prism assembly may alternatively be used, which is part of the beam splitting assembly 14, and allows the samples to be placed face down. This orientation allows gravity to assist in maintaining the sample in a stable viewing position. Maintaining a stable viewing position is also enhanced by the use of the window 20 as shown in FIG. 1.

A top view of the instrument is illustrated in FIG. 1a. Typical dimensions are given in FIG. 1a to illustrate the compacted size of the confocal imaging head 32. The elements in the head 32 may be located on a single board to provide unitized construction. The height of the head may be approximately two inches from the base to the nominal focal point of the focusing lens 18.

By scanning using the mechanical actuators 34 successive lines may be scanned at successive depths to provide images of vertical sections (i.e., along a vertical plane through the tissue sample). If desired the images may be formed from horizontal sections (i.e., along a horizontal plane through the tissue sample) as the lines are scanned horizontally. By tilting the sample, sections at desired angles to the surface of the sample (i.e., along a tilted or non-perpendicular plane) may be formed, such sections may also be formed by moving the lens 18 via actuator 34 as desired angles.

Referring to FIG. 2, there is shown a block diagram of the data acquisition and analysis system which is part of the imaging system 10 provided by the invention. The confocal head 32 is the head shown in FIGS. 1 and 1a. The output 36 from the head 32 is the output from the pinhole detector assembly 30. This output 36 is the confocal detector signal. Signals are also provided from sensors 38, namely a lateral position sensor and a vertical position sensor. These signals after amplification and filtering are acquired by a analog to digital converter of a digital I/O board 40. This board 40 may also be on a board with a circuit which provides a digital to analog channel to drive the lateral motion actuator. The vertical scanning actuator is driven from a signal derived from a conventional signal generator 42. The A to D, D to A and digital I/O board 40 is controlled and data is acquired via software in a personal computer 44, such as a Macintosh Quadra 950. Conventional software packages may be used for image analysis and for driving a display 46, which is shown by way of example as a 1472 by 1088 pixel display.

Referring to FIG. 3, there is shown the confocal imaging head 32 contacted against the skin 48 of a subject specimen using a mineral oil as an optical index matching fluid, which is an optical contact liquid 21 (FIG. 1) for reducing undesired reflections of light from the surface of the skin. The force against the skin 48 will be limited to that required to press the skin against the contact window 20 of the head 32. A laser beam 50 which may be relatively low power (e.g., 6.3 milliwatts of optical power) is focused into the dermis of the specimen. The laser is operated at a wavelength capable of penetrating into the skin of the specimen, thus the skin may be considered transparent to the laser wavelength (or in other words, the skin is permeable to electromagnetic radiation of specified frequencies). The depth of focal point or spot 52 is the varied from the surface of the stratum corneum to a few millimeters below the surface of stratum corneum. The nominal beam spot size may be, for example, 2.5 micrometers, full width half maximum. The laser spot is scanned laterally across the skin, for example at a rate of 3 to 10 hz. Different laser wavelengths may be selectively used for different resolution. Inasmuch as the energy delivered is proportional to the illuminating flux focused divided by the diameter of the spot, the scan length and the scan rate or frequency, the amount of incident flux is sufficiently low that damage to the specimen is avoided. The light scattered by the tissue is collected and the lights coherent component is re-imaged onto the pinhole aperture 54 of assembly 30, as shown in FIGS. 1 and 1a. The pinhole 54 transmits the coherent light from the focal region of the incident beam 53 to the detector 55 (of assembly 30) where it converts the light into an electrical signal. As the lens 18 scans laterally, the electrical signal is acquired by the computer and stored. Each scan represents a one dimensional trace of the reflectivity and scattering cross section of the dermis at a given level below the surface of the skin 48. A series of scans are made with the focal point positioned at progressively lower depths thereby providing a vertical cross section image of the skin which may be similar to a B-scan ultrasound image. As stated earlier, these scans may also be horizontal to provide a horizontal cross-section, or at an angle to provide an angular cross-section of the skin.

From the foregoing description it will be apparent that there has been provided an embodiment of a confocal imaging system for dermatological pathology applications. Variations and modifications of the herein described system and other applications for the invention will undoubtedly suggest themselves to those skilled in the art. Accordingly, the foregoing description should be taken as illustrative and not in a limiting sense. 

What is claimed is:
 1. A handheld microscope imaging apparatus for imaging tissue comprising: a source for producing an illumination beam; a window capable of defining a tissue contacting surface in pressure contacting relationship with a surface of said tissue; and an objective lens which focuses said beam through said window to said tissue, wherein said window couples the focused beam to said tissue, and said objective lens receives returned light of the beam from said tissue through said window representative of at least one section having tissue structures for pathological application in which said window is composed of solid material transparent to said beam.
 2. The apparatus according to claim 1 further comprising a housing having at least said window, said objective lens, and means for moving said objective lens with respect to said tissue surface.
 3. The apparatus according to claim 1 further comprising an index matching fluid between said contact surface and said tissue sample.
 4. The apparatus according to claim 1 further comprising a housing capable of being handheld having at least said objective lens and said window.
 5. The apparatus according to claim 1 wherein said objective lens has a numerical aperture of less than
 1. 6. The apparatus according to claim 1 wherein said returned reflected light of the beam from said tissue sample represents a section suitable for pathological application.
 7. The apparatus according to claim 1 further comprising a display for viewing images of said tissue sample acquired through said objective lens.
 8. The apparatus according to claim 7 wherein said display is an electronic display.
 9. The apparatus according to claim 1 wherein said objective lens is spaced from the window.
 10. The apparatus according to claim 1 further comprising an index matching fluid between said window and said tissue sample.
 11. The apparatus according to claim 1 wherein said illumination beam at said window represents a scanned illumination beam which is scanned through said tissue to provide said returned light representative of said at least one section.
 12. The apparatus according to claim 1 wherein said returned light of the beam represents returned reflected light of the beam from said tissue through said window representative of at least one section of the tissue.
 13. A microscope imaging apparatus for imaging tissue samples for pathological applications comprising: an objective lens of said microscope: a window defining a tissue contacting surface capable of being in a pressure contacting relationship with a surface of said tissue sample when said tissue sample is imaged by said objective lens through said window to view at least one section having tissue structures for pathological application; and an illumination beam which is focused by said objective lens through said window to said tissue sample, wherein said window represents a plate of material transparent to said illumination beam.
 14. The apparatus according to claim 12 wherein said plate is composed of glass.
 15. The apparatus according to claim 13 wherein said illumination beam focused by said objective lens through said window represents scanned illumination.
 16. The apparatus according to claim 13 further comprising means for scanning the illumination beam through said tissue.
 17. The apparatus according to claim 13 further comprising a housing capable of being handheld having at least said objective lens and said window. 